Oscar gassett



(No Model.)

0. GASSETT.

STEAM TRAP.

No. 528,665. Patented Nov.. 6, 1894.

(No Model.)

v 2 Sheets-heet 2.' O. GASSETT.

STEAM TRAP.

Patented Nov. 6, 1894.

UNITED STATES PATENT OFFICE.

OSCAR GASSETT, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE CROSBY STEAMGAGE AND VALVE COMPANY, OF SAME PLACE.

STEAM-TRAP.

srEcIFIcATIoN forming pere ef Lettere Peteur Ne. saaeeauetea November e,1894.

Application tiled February 15 1894i Serial No. 500,265. (No model.)

To all wlwm it may concern:

Be it known that I, OSCAR GASSETI, acitizen of the United States,residing at Boston,Y

in the county of Suffolk and State of Massachusetts, have inventedcertain new and useful Improvements in Steam-Traps; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to an improvement in steam traps. f

The object 'of the invention is to secure a quick, positive and a largeopening for the discharge of water from the steam pipes leading to thesteam trap, and, in order to accomplish such result, it is .found thatit requires a secondary, large or main valve to Work in unison with thesmall or primary valve, as hereinafter described.

In constructing such a device it is found that the governin g parts mustbe placed Within the steam space, free from the external iniiuence oftemperature, of the atmosphere, and other iniluences.

The present invention consists'in the construction hereinafter pointedout.

In the accompanying drawings, Figure l represents a face view of thesteam trap; Fig. 2, a transverse vertical section taken through Fig. 1,the parts being enlarged. Fig. 3 represents a detailsectional view takenthrough aportion of the trap at a right angle to Fig. 2.

In the annexed drawings, the letter A represents the trap body beingcircular in form as shown, and leading into this body is the inlet pipec, and leading from it the outlet pipe c and the drain pipe c2, thelatter being provided with a Vsuitable cock c3. Secured within the trapbody A is the case B being i held therein by bolts b passing through theflanges b. This case B has within it at the bottom the chamber b2leading into which are the small openings b3 at the sides and at lthebottom the circular bore b4. Above this chamber b2 the case B has adiaphragm C in which there is a central passage c laligned with the boreb4 and having on theunder side the conical portion c` forming a valveseat. Above the diaphragm C within the valve ycase B there is anothercylindrical chamber D having the shoulder d which divides this chamber Dinto two portions d and d2 of difterentdiameters. At one side there isan opening d3 leading into the chamber D, this outlet d3 communieatingwith the discharge pipe a', and at the top this outlet d3 has adivergent portion d4. Within the chamber b2 is placed a valve E havingthe conical portion e to fit the valve seat c', and a stem e extendingthrough Athe opening c and up into the chamber D. This valve E snuglytits the opening b4. This valve E has a central bore e2 leading up intoit from the under side. Within this bore e2 is placed the upper end of aspring F the lower end of said spring resting inside the plug f which isthreaded into the bottom of the steam trap body A. At its top the steme' of the valve E rests in a socket g of a piston G which fits withinthe upper part d of the chamber D. This piston G has an annular groove gnear its bottom, the location of this groove. being'such that itcommunicates with the portion d4 of the passage d3 when the piston G isat the upper part of its stroke. The passage g2 leads from this annularpassage g out of the top of the piston G and into a circular recess g3of such piston. Upon the top of the valve or piston case B there issecured a cap H having at its center the threaded bore hterminating inacountersink h within the cap, there being a space between this cap andthe top of the piston G. This space and the recess g3 form a chamberabove the piston G.

In the top of the steam trap body A there is a threaded hole a4 in whichis secured the lower threaded end k of a pipe K. To the top of this pipeK is secured a cap lo having at its top a hole k2 anda stuffing box k3,the top also being made with a hole 7c4 closed by a tap screw 165.Secured in the hole h of the cap H is the lower end Z of a pipe Lsmaller than the pipe K. This pipe L extends from the cap H up centrallythrough' the pipe K,A

and the upper end Z of the pipe L terminates near the lower part of thehole k2 inthe cap lc of the pipe K. Rods M, M rise from the top ofthetrap body A, and carry at their top the cross head N. A't the`middle ofthis cross head N is a hole n through which passes ICO loosely the upperend o of a rod O, the lower end o of such rod passing down through thehole 7a2 of the cap k and having a conical end o2 which terminates justabove the top Z of the smaller pipe L. Surrounding the rod O below thecross head, is a spring P, one end of which bears against the cross headand the other against a nut p secured on a rod O. Above the cross head Nan adjusting nut 19 is screwed upon the protruding end o of the rod O. Aprotective cap Q may he placed above the adjusting nut and protrudingend of the rod O, and be secured to the cross head N.

In use steam passing through the pipe a into the steam trap body Apasses up into the pipe K and down through the pipe L. The steam heatingthe pipe L causes it to eX- pand until the upper end Z of the pipe Lcomes in contact with the conical end o2 of the rod O, thus forming avalve, the spring P permitting sufficient play of the rod O to preventany strain upon the parts. The pipe L continues in contact with the rodO closing the opening between the two until sufficient water ofcondensation enters the trap, when the water,being cooler than thesteam, causes the pipe L to contract, thus causing the end Z to withdrawfrom the rod O, thus opening the valve at this point. Vhen this happensthe water of condensation pours down through the pipe L and into thechamber of the valve case B above the piston G. This water pressing uponthe piston G forces it and the valve E downward, opening the valve E atits valve seat c. This action of the water, as thus described, is owingto the fact that the area of the piston G being greater than that of thevalve E the pressure of water upon the piston G is greater than thecombined pressure of water and the spring F upon the valve E. The waterof condensation then pours through the opening b3 and through the valveseat c, opening o into the chamber (Z2 and out through the dischargepipe a. This continues until the water of condensation shall have leftthe valve body. Steam then again enters the valve body, expands the pipeL as already described, and closes the opening between the pipe L andthe rod O. Whatever there may be left of the water of condensation abovethe piston G, or whatever modicum of steam may enter the pipe L as thesteam takes the place of the water of condensation in the trap they passout through the passages g2, g into the discharge pipe ci so that thereis no back pressure against the piston G which would tend to resist theaction of the steam in forcing the valve E to its seat and closing it;and by having the passage g communicating with the portion d4 of thepassage d3 even after the piston G is returned to its uppermost positionwhatever steam there may be above it will gradually pass out into thedischarge pipe a.

By examiningthe drawings it will be seen that, when the piston is pusheddown itwill also push down the valve in order to open it, and when openit allows the discharge to run into the cylinder and against the lowerend of the piston. The said piston in its descent cuts off a portion ofthe said discharge d3 until the piston has backed up pressure enoughbelow the piston to prevent its descent to the bottom ot' the cylinder.

Having thus described my invention, what I claim is l. The combinationin a steam trap of a valve provided with a piston which controls thedischarge from such trap and a pipe valve which communicates at one endwith the piston and at the other end opens out into the trap, as setforth.

2. The combination in a steam trap of the steam trap body A; the pipe Kleading therefrom; the piston and case B; the piston therein; the pipe Lleading from within the valve case above the piston, up into the pipe K;the rod terminating within the pipe K near the top of the pipe L; theinlet a into the trap body and the discharge pipe a leading from thepiston or valve case B, as set forth.

3. The combination of the secondary, large or main valve with the smallor primary valve, the latter being at the end of an expansion pipe whichcommunicates at one end with the interior of the trap and at the otherend with a chamber above the main valve, as set forth.

et. The combination of the secondary, large or main valve, the small orprimary valve pipe, L, the rod, O, the spring, P, and abearing on therod and on the trap frame between which bearings the spring bears, asset forth.

In testimony whereof lai-Tix my signature in presence of two witnesses.

OSCAR GASSETI.

IVitnesses:

JOSHUA I-I. MILLETT, ARTHUR L. BowKER.

IOO

